amélioration hydra + retour au paquet par défaut

public/service-hydra-core.nix

@@ -5,8 +5,23 @@ let
   cfg = config.r6d.config-generator;
   computers = config.r6d.computers;
   profiles = config.r6d.profiles;
-in
 
+
+  #### https://github.com/NixOS/hydra/issues/413
+  # Note that we use 'import <nixpkgs> {}' instead of 'pkgs'.
+  # If we use the latter we get an infinite recursion
+  # because we include hydra-src in the module imports below which in turn defines the 'pkgs' value.
+  hydra-src = (import <nixpkgs> {}).fetchgit {
+    url = "https://github.com/NixOS/hydra.git";
+    rev = "de55303197d997c4fc5503b52b1321ae9528583d";
+    sha256 = "0nimqsbpjxfwha6d5gp6a7jh50i83z1llmx30da4bscsic8z1xly";
+  };
+
+  hydra-src-pkg = lib.mkDefault ((import (hydra-src + /release.nix) {}).build.x86_64-linux);
+
+  # information pour l'état de hydra :
+  # hydra-queue-runner --status | json_pp
+in
 mkIf cfg.hydra-core {
 
   # Paquets
@@ -43,6 +58,11 @@ mkIf cfg.hydra-core {
     listenHost = "localhost";
     minimumDiskFree = 50; # Go
     smtpHost = "localhost";
+    package = hydra-src-pkg ;
+  };
+
+  systemd.services.hydra-evaluator = {
+    path = [ pkgs.nettools config.services.hydra.package ];
   };
 
   ## Ménage